Comparison of the efficiency of KRAFT Led lamps and led panels

3. Power factor, cos φ
Active power is spent on useful work. Jet electricity is a part of full power that is not spent on useful work. The closer the magnitude cos φ to 1, the better.

4. Light flux, Lm
The higher light flux number the more light you get from lighting device. 

5. Light output, Lm/W
Light output is the ratio of the light emitted by the light source to the power consumed by it. It is an indicator of efficiency and economy of light sources.

6. Color temperature, K
The color temperature is responsible for the shade of light. Normally three shades are distinguished: warm (≈2700-3000 K), neutral or white (≈4100 K) and cold (≈ 6500 K).

7. Color transfer index, Ra
The higher Ra index, the more natural lighted objects will look. Maximum Ra — 100 (sun). Ra from 70 to 79 is good. Ra from 80 to 89 — very good.

8. Full power taking into account the power factor  cos φ, VА
The total power of the lamp is calculated by the formula:
P = UI,
where Р — total power (Вт), U — voltage (В), I — current strength (A). The voltage at test was 220 V. The current strength is subtracted from item 2. For KRAFT LED:
P = 220 × 0,131 = 28,82
For the LED panel:
P = 220 × 0,311 = 68,4

9. Warranty, years
The warranty period for KRAFT LED is one and a half times longer.